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Courtesy of Lincoln Electric TIG WELD 4130! The Lincoln Electric Company, Welding Services. June 2000 Yes, you can TIG weld 4130 tubing up to .120" wall thickness easily with the techniques and procedures described in this bulletin. Answered are the top ten most frequently asked questions about TIG welding 4130 Chrome-Moly. These attached procedures apply to typical sporting applications such as experimental airplanes, racing car frames, roll cages, go-carts, bicycles, and motorcycle frames. The suitability of these techniques and procedures must be evaluated for your specific application. Q. Can I weld 4130 using the TIG process? A. Yes, 4130 Chrome-Moly has been TIG welded in the aerospace and aircraft industries for years. As with all welding, proper procedures and techniques must be followed. Q. Do I need to pre-heat? A. Thin wall tubing (< 0.120" wall) applications do not typically require the normal 300ºF to 400ºF pre-heat to obtain acceptable results. However, tubing should be at room temperature (70ºF) or above before welding. Q. What filler material do I use? A. Although there are several good filler materials, ER80S-D2, is one you should consider. This filler material is capable...